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Type:
Bug
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Resolution: Done
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: Querying
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Labels:
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Fully Compatible
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ALL
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QuInt D (12/14/15)
The "nreturned" field is never displayed in the diagnostic log line generated by the getMore command. "nreturned" is properly shown for legacy OP_GET_MORE requests.
Reproduce with the following script:
> db.foo.drop() true > db.foo.insert([{},{},{},{},{}]) BulkWriteResult({ "writeErrors" : [ ], "writeConcernErrors" : [ ], "nInserted" : 5, "nUpserted" : 0, "nMatched" : 0, "nModified" : 0, "nRemoved" : 0, "upserted" : [ ] }) > db.getMongo().forceReadMode('commands') > db.foo.find().batchSize(3).itcount() 5 > db.getMongo().forceReadMode('legacy') > db.foo.find().batchSize(3).itcount() 5
Output from the server when "commands" read mode is forced ("nreturned" not present for getMore):
2015-12-02T17:48:07.148-0500 I COMMAND [conn1] command test.foo command: find { find: "foo", filter: {}, batchSize: 3.0 } planSummary: COLLSCAN cursorid:30116070077 keysExamined:0 docsExamined:3 keyUpdates:0 writeConflicts:0 numYields:0 nreturned:3 reslen:174 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 0ms
2015-12-02T17:48:07.149-0500 I COMMAND [conn1] command test.foo command: getMore { getMore: 30116070077, collection: "foo", batchSize: 3.0 } ntoreturn:1 ntoskip:0 cursorExhausted:1 keyUpdates:0 writeConflicts:0 numYields:0 reslen:130 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 0ms
Output from the server when "legacy" read mode is forced ("nreturned" present for getMore):
2015-12-02T17:48:13.083-0500 I QUERY [conn1] query test.foo planSummary: COLLSCAN cursorid:33369655876 ntoreturn:3 ntoskip:0 keysExamined:0 docsExamined:3 keyUpdates:0 writeConflicts:0 numYields:0 nreturned:3 reslen:86 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } 0ms
2015-12-02T17:48:13.084-0500 I QUERY [conn1] getmore test.foo cursorid:33369655876 ntoreturn:3 cursorExhausted:1 keyUpdates:0 writeConflicts:0 numYields:0 nreturned:2 reslen:64 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } 0ms